Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 791 · 40 questions

The trick (Last digits only): Multiply (or add) only the last digits of the two numbers. The last digit of that result is the last digit the answer must have. Different last digit → wrong for sure. Same last digit → it passes the check (work it out in full to be certain).

1. 1.Last-digit check: is 759 + 899 = 1658 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 43 × 51 = 2200 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 238 + 973 = 1219 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 27 × 13 = 351 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 321 + 439 = 760 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 989 + 330 = 1319 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 40 × 31 = 1240 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 181 + 486 = 667 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 79 × 99 = 7821 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 140 + 521 = 663 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 841 + 991 = 1832 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 12 × 74 = 885 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 325 + 794 = 1119 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 31 × 79 = 2455 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 515 + 133 = 647 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 36 × 20 = 720 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 380 + 149 = 530 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 39 × 20 = 776 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 91 × 43 = 3913 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 61 × 19 = 1159 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 218 + 473 = 695 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 77 × 19 = 1463 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 65 × 35 = 2267 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 578 + 695 = 1273 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 74 × 76 = 5624 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 715 + 307 = 1025 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 907 + 656 = 1563 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 17 × 65 = 1105 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 35 × 39 = 1371 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 47 × 68 = 3196 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 78 × 82 = 6396 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 56 × 58 = 3248 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 76 × 50 = 3809 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 787 + 970 = 1757 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 124 + 607 = 726 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 25 × 90 = 2250 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 19 × 87 = 1661 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 64 × 32 = 2046 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 114 + 437 = 551 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 205 + 782 = 994 right or wrong? (a) Right (b) Wrong

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